The current invention is a furnace control unit that is affixed to a electronic on/off switch that controls a heating unit. The furnace control unit has a programmable processing unit, display unit, power source, input buttons, a switch flipping means. It is attached next to the electronic on/off switch that control a heating source. The unit would be programmed to turn the switch on or off depending on input criteria such as time of date and temperature.

A control system may include a thermostat device and boiler control device. The thermostat device may be configured to receive electrical power from second wiring terminals and provide control signals to boiler control device using a second radio when wires are not present in first wiring terminals. The thermostat device may also be configured to receive electrical power from the first wiring terminals and provide the coded control signals to the boiler control device through the first wiring terminals when wires are present in the first wiring terminals. The boiler control device may be configured to receive the control signals from the thermostat device using a third radio and selectively couple the third wiring terminals to fifth wiring terminals to selectively control activation of the boiler-based heating system when wires are not present in fourth wiring terminals.